[css-counter-styles] Explicitly test zero values for 'pad' and 'addit…

…ive-symbols' descriptors (web-platform-tests#28665) This would've caught I bug I made in WebKit's @counter-style implementation.
mrego · Apr 23, 2021 · 1e0d3a6 · 1e0d3a6
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diff --git a/css/css-counter-styles/counter-style-additive-symbols-syntax.html b/css/css-counter-styles/counter-style-additive-symbols-syntax.html
@@ -15,6 +15,7 @@
 
 // [ <integer [0,∞]> && <symbol> ]#
 
+test_valid_additive_symbols('0 "X"');
 test_valid_additive_symbols('1 "X"');
 test_valid_additive_symbols('"X" 1', '1 "X"');
 test_valid_additive_symbols('5 "V", 1 "I"');

diff --git a/css/css-counter-styles/counter-style-pad-syntax.html b/css/css-counter-styles/counter-style-pad-syntax.html
@@ -17,6 +17,7 @@
 
 test_invalid_pad('10');
 test_invalid_pad('"X"');
+test_valid_pad('0 "X"');
 test_valid_pad('10 "X"');
 test_valid_pad('"X" 10', '10 "X"');
 test_invalid_pad('-1 "X"');